Helmet shell



FIG. 1 is a front view of a helmet shell showing my new design, a rear view being a mirror image thereof;

FIG. 2 is a left side view of the helmet shell;

FIG. 3 is a right side view of the helmet shell;

FIG. 4 is a top view of the helmet shell;

FIG. 5 is a bottom view of the helmet shell; and,

FIG. 6 is a top front side perspective view of the helmet shell.

The broken lines in FIG. 6 are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a helmet shell, as shown and described. 